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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409cc57485291b20c37e5c0b32514c9f12f4bff4c3d367fe19753635e32ec6b6' 
  AND token = 'U6AAgE/ivalBASdfficXpKH1HXJw0qQGE9wrJCnnSxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}